In fact, combined e-cigarette and cigarette use among adolescents in 2014 was higher than total cigarette use in 2009, according to the study.
事实上，据研究发现，2014年同时在抽烟和抽电子烟的青少年数量要比2009年显示的吸烟数据更高。
User flow chart, use-case diagram, total model management view, physical configurement view and E-R diagram of database model are set up.
系统总体模型管理视图、各子系统的物理配置视图；数据库模型E-R图。
Total utility is equal to the product of the average utility and the number of oranges — i. e. , this is a definition of average utility consistent with our usual use of the term average.
总效用等于平均效用和橙子数量的乘积——即是说，这是平均效用的定义，该定义符合我们平常所用“平均”一词的含义。
Total utility is equal to the product of the average utility and the number of oranges — i. e. , this is a definition of average utility consistent with our usual use of the term average.
总效用等于平均效用和橙子数量的乘积——即是说，这是平均效用的定义，该定义符合我们平常所用“平均”一词的含义。
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